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DiscoverCircuits.com -- Hobby Corner
Last Updated on:
Tuesday, June 01, 2021 03:06 PM
Hobby Circuits List
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LINK to Dave's circuit, but DO NOT COPY any files to your WEB
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More
Hour Meters |
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MACHINE VIBRATION TRIGGERS
HOUR METER |
This hobby circuit allows an
off-the-shelf battery powered digital hour meter to be turned on and off, according
to a machine's operation, without requiring a direct electrical connection to the
machine. Machine vibrations are detected by an off-the-shelf piezoelectric wafer.
The wafer is normally used as a sound generator. The 3v power could be tapped from
the hour meter's own lithium battery or from a separate 3v lithium battery. The
circuit only draws about 1.5uA, so a 250mA-hr battery would power the circuit for
about 10 years.
Published in EDN, Jan 16, 1997 |
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Click on Circuit Below to view PDF of Schematic |
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